U511 User’s Manual Parameters
Version 1.1 Aerotech, Inc. 4-17
Conversion factors (i.e., parameters x00 and x01) are represented using a standard
floating point number (e.g., 1.0) in the software package.
To calculate the conversion factor, the user will need:
1. The number of machine steps per programming unit.
This is the number of encoder counts in 1 inch, 1 mm, or 1 degree, etc.
2. The number of program steps per program unit.
This value is related to the number of decimal digits (ndec) parameter. Refer to
Table 4-8.
Table 4-8. Relationship Between Number of Decimal Digits Parameters and
the Number of Programming Steps per Programming Unit
Smallest Programming
Unit
Number of Decimal Digits
(ndec) Parameter
Program Steps per
Programming Unit
0.1 1 10
0.01 2 100
0.001 3 1,000
0.0001 4 10,000
0.00001 5 100,000
0.000001 6 1,000,000
0.0000001 7 10,000,000
0.00000001 8 100,000,000
The “Number of Decimal Place Digits” parameter needs to be entered separately in
the axis plane. This should be done for both English and Metric scale factors.
A rotary axis has a 5000-line encoder with a “times 10” external multiplier box.
Calculate the conversion factor so that the programmed unit is in degrees with a
resolution of 0.001 degrees.
The total machine step count is 5000 x 10 x 4 (= 200,000 counts per revolution) every
360 degrees. The number of machine steps per programming unit is 200000/360 =
555.55555555. The value 10
ndec
= 10
3
= 1000. The calculated conversion factor is
555.55555555/1000 = 0.55555555. Enter 0.55555555 in the value box.
Consider the example of a system that has a 4 mm pitch ball screw (i.e., 4 mm/rev) and a
1,000 (x 4) line encoder. From this information, the English and Metric conversions are
accomplished as follows:
E
Example 1
Example 2
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